[R-390] tube extenders

[Roger L Ruszkowski]

Snip.. ---------------------------------
By the way, you said the voltage levels can be checked with the tube out of
the socket.  How do you check grid or cathode voltages without the tube in
place drawing grid current through its respective resistances?  In some
instances, isn't this impossible?

Barry - N4BUQ
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Barry,

Now you want me to remember some thing.

A. we did not advocate tube extenders.
B. there were numbers in the TM.
C. we had a TS505 meter.

I think the meter was to measure the pins with
no tube in the socket.

Some one asked if tubes could be pulled with the power on.

I think the numbers in the TM were for the expected voltage
to be found on the pin when the tube was out.

Thus no one reading the TM would have any clue what voltage was
seen on the pins when the tube was in and operating.
You have no clue from the TM what would be seen with a scope
and you had not clue what you would find checking
under the deck with a meter.

From the way the TM reads, you could pull a tube and read
the voltage on the tube pins. So you can operate the receiver
with tubes pulled out. Should you turn the receiver
off  before you pull the tube?

Some one jump in here with the Y2K manual before
Barry has to hurt me.

What about operating with one 26Z5?
What about the 6080's?
What about the voltage regulator.

What does the TM say to do for the OA2?
Measure 150 on the test point.
What is listed for the pin voltage in the TM?
Is it 150 or the unregulated voltage?
Or does the TM say do not do that?

Roger.